TABLE 1

Simulated Shifts Introduced into Image Frame

Shift	Minimum shift	Maximum shift	Start frame	Number of frames	Initial shift	Return shift
Abrupt
Whole-pixel	1	1	44	7	↑	↓
	3	3	59	2	↓	↑
	2	2	64	7	↑	↓
Fractional	2.5	2.5	59	7	↓	↑
	3.5	3.5	78	2	↑	↓
Gradual
Whole-pixel	1	4	59	5	↓	↑
	1	3	69	4	↑	↓
Fractional	0.25	1.5	59	7	↑	↓
	0.5	3	49	7	↑	↓
	0.25	1	59	5	↓	↑

↑ = shift up; ↓ = shift down.